Copy of Physical vs Chemical Change

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Transcript of Copy of Physical vs Chemical Change

Physical vs Chemical Change Mr. Collins Chemical ChangeAny process that changes one substance into a brand new substance.Physical ChangeA type of change in which the form of matter is altered BUT one substance is not transformed into another.Examples of a Physical Change:Examples of ChemicalChanges:Combustion, like the burning of acandle, is an example of aChemical Change.

When iron rusts it oxidizes.That's a Chemical Change.You can't put sour milk backto how it was. It's irreversible...and gross.Sour MilkIron RustsBurning WoodYou can't recover the wood by a reverse process...unless you're a wizard...in which case, you need to be at Hogwart's.Mixing Vinegar and Baking SodaBecause it rearranges the molecules. How can you fix that?Digesting FoodA new substance is formed. You're body can't run on nachos, so it turns nachos into something it can run on.Cooking an EggYou can't reverse cooking an egg...unless you're a wizard...in which case, you should use your powers for good instead of evil.Baking a CakeIt can't be change back into the mixture...unless you're a wizard...in which case, you're wasting your powers on messing with delicious foods.Using a BatteryThe electric current is produced by a chemical change within the battery. Popping PopcornThe starch in the kernel are converted to a form that is easier to eat and digest.Fruit Rotting It is losing water and new chemicals are entering. Use your magical powers to make my fruit last longer, Harry!Moldy CheeseA new product is made, and it looks delicious!Rusting NailsIt's being oxidized into a new substance.Roasting a MarshmallowIt starts off white, and then it eventually melts, and that means you can't change it back...unless...It's irreversible. Trust me. I'm a wizard.Paper Becomes Ash Boiling Water All changes of state are physicalchanges. Melting an Ice CubeNo new substance is formed.The glass pieces can be rearranged.Breaking a GlassDissolving Sugar in WaterThe substances may change formbut not what they are.Shredding PaperYou're not actually changing the makeupof the substance, just the way it looks.Chopping WoodYou're just changing the way it looks.Sublimating Dry Ice Its just a change of state.Crushed CanSame properties, just adifferent shape.Sharpening a Pencil.You only changed the size and shape of the pencil. Cutting IronIts still iron...duh.Bread Dough RisingIt can change back, becauseas it rises, it can pop.Melting IronMelting is just a transition between states of matter. Which ones?!Freezing WaterIts only a change of state.EvaporationWhy is this a physical change?